eth: fix comment typo in handler.go (#20575)

eth/handler.go

@@ -749,8 +749,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 	return nil
 }
 
-// BroadcastBlock will either propagate a block to a subset of it's peers, or
-// will only announce it's availability (depending what's requested).
+// BroadcastBlock will either propagate a block to a subset of its peers, or
+// will only announce its availability (depending what's requested).
 func (pm *ProtocolManager) BroadcastBlock(block *types.Block, propagate bool) {
 	hash := block.Hash()
 	peers := pm.peers.PeersWithoutBlock(hash)